According to spokesman Glen Johnson, Heinz Kerry, 74, is expected to make a full recovery at home after some limited out-patient treatment. She has also resumed routine family activities with husband, Secretary of State John Kerry.

Heinz Kerry was hospitalized July 7 after suffering a seizure on Nantucket where the couple owns a home. She was taken to Massachusetts General Hospital then transferred to Spaulding as her condition improved.

Johnson previously said the cause of the seizure had not been determined but doctors had ruled out a brain tumor, heart attack or stroke.

Both Heinz Kerry and the secretary of state said in statements that they are thankful for all the doctors and nurses who provided treatment.

"It was amazing, a miracle," said Heinz Kerry of her care and caregivers. "They are the kindest people, who love what they do and do it superbly well."

"I'm extremely grateful for the quality of care Teresa received," Kerry said in the statement. "I've always known Massachusetts is blessed to have some of the greatest health care in the world, but we've just lived it, and are grateful to all."

Heinz Kerry, an heir to the Heinz ketchup fortune, is the widow of former U.S. Sen. John Heinz, who was killed along with six others in 1991 when a helicopter collided with a plane over a schoolyard in Merion, Pennsylvania. She married Kerry, a longtime senator from Massachusetts, in 1995.